On 21.03.2016 19:13, [email protected] wrote:
> Negative SMTP reply: 504 5.5.2 <android-8513f86d1377e753>: Helo
> command rejected: need fully-qualified hostname

The server rejects the argument to the HELO (or more likely EHLO)
command. The argument is the hostname of the machine connecting to the
server, i.e. your device. "android-8513f86d1377e753" is probably what we
get from Android, but it's not a valid FQDN and hence rejected by your
SMTP server.
If you have control over the server you should disable (strict)
HELO/EHLO checks for authenticated SMTP. The chances that any email
client can provide a meaningful value are slim.


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